DE3883011D1 - INTERFACE CIRCUIT FOR A LINEAR VARIABLE DIFFERENTIAL TRANSFORMER. - Google Patents

INTERFACE CIRCUIT FOR A LINEAR VARIABLE DIFFERENTIAL TRANSFORMER.

Info

Publication number
DE3883011D1
DE3883011D1 DE8989900957T DE3883011T DE3883011D1 DE 3883011 D1 DE3883011 D1 DE 3883011D1 DE 8989900957 T DE8989900957 T DE 8989900957T DE 3883011 T DE3883011 T DE 3883011T DE 3883011 D1 DE3883011 D1 DE 3883011D1
Authority
DE
Germany
Prior art keywords
lvdt
interface circuit
responsive
providing
decoder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE8989900957T
Other languages
German (de)
Other versions
DE3883011T2 (en
Inventor
Lawrence Devito
A Brokaw
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Analog Devices Inc
Original Assignee
Analog Devices Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Analog Devices Inc filed Critical Analog Devices Inc
Publication of DE3883011D1 publication Critical patent/DE3883011D1/en
Application granted granted Critical
Publication of DE3883011T2 publication Critical patent/DE3883011T2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
    • G01D5/225—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils
    • G01D5/2258—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils by a movable ferromagnetic element, e.g. core
    • G01D5/2266—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils by a movable ferromagnetic element, e.g. core specially adapted circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
    • G01D5/2208—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the self-induction of the coils
    • G01D5/2216—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the self-induction of the coils by a movable ferromagnetic element, e.g. a core
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
    • G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/16—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division
    • G06G7/161—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division with pulse modulation, e.g. modulation of amplitude, width, frequency, phase or form

Abstract

A monolithic interface circuit for use with a linear variable differential transformer (LVDT) position transducer includes a drive circuit for providing an excitation signal of selectable frequency and amplitude to the LVDT primary winding. The interface circuit further includes a decoder responsive to signals induced in the LVDT secondary windings for computing the position p of the LVDT core as a solution to the equation p = K(A-B)/(A+B), where A and B represent the signals induced in the primary winding, and K is a constant scale factor. The decoder includes circuitry for rectifying (54,64) and filtering (56,66) the secondary signals (A,B), a charge balance loop (58,68,70,72,74) responsive to the detected signals for providing a binary signal having a duty cycle representative of B/(A+B), and an output circuit (80,82,86,88,90,92,94) responsive to the binary signal for providing the position output. The decoder provides excellent scale factor stability and linearity and is relatively insensitive to variations in primary drive amplitude. <IMAGE>
DE89900957T 1987-11-13 1988-10-19 INTERFACE CIRCUIT FOR A LINEAR VARIABLE DIFFERENTIAL TRANSFORMER. Expired - Lifetime DE3883011T2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/120,118 US4904921A (en) 1987-11-13 1987-11-13 Monolithic interface circuit for linear variable differential transformers
PCT/US1988/003668 WO1989004949A2 (en) 1987-11-13 1988-10-19 Interface circuit for linear variable differential transformer

Publications (2)

Publication Number Publication Date
DE3883011D1 true DE3883011D1 (en) 1993-09-09
DE3883011T2 DE3883011T2 (en) 1994-03-17

Family

ID=22388376

Family Applications (2)

Application Number Title Priority Date Filing Date
DE3855838T Expired - Lifetime DE3855838D1 (en) 1987-11-13 1988-10-19 Interface circuits for linear variable differential transformers
DE89900957T Expired - Lifetime DE3883011T2 (en) 1987-11-13 1988-10-19 INTERFACE CIRCUIT FOR A LINEAR VARIABLE DIFFERENTIAL TRANSFORMER.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE3855838T Expired - Lifetime DE3855838D1 (en) 1987-11-13 1988-10-19 Interface circuits for linear variable differential transformers

Country Status (6)

Country Link
US (1) US4904921A (en)
EP (3) EP0398901B1 (en)
JP (1) JPH03501885A (en)
AT (2) ATE150545T1 (en)
DE (2) DE3855838D1 (en)
WO (1) WO1989004949A2 (en)

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US5327030A (en) 1987-11-13 1994-07-05 Analog Devices, Inc. Decoder and monolithic integrated circuit incorporating same
US5109675A (en) * 1990-10-10 1992-05-05 Westinghouse Electric Corp. Valve position sensing circuit
US5087866A (en) * 1991-05-22 1992-02-11 Lucas Industries Temperature compensating circuit for LVDT and control system
US5864215A (en) * 1992-03-06 1999-01-26 Hughes Aircraft Company Steering apparatus for controllably displacing a structure relative to a frame member
WO1993020409A1 (en) * 1992-04-02 1993-10-14 Micro-Epsilon Messtechnik Gmbh & Co. Kg Sensor-drive and signal-processing method______________________
DE4220596C1 (en) * 1992-06-24 1993-12-09 Mfp Mestechnik Und Fertigungst Transmission factor measuring circuit for variable transmission circuit e.g. differential transformer path sensor - determines factor from difference in period of oscillation of series integrator and comparator oscillator when circuit is connected and disconnected.
US5422555A (en) * 1993-04-30 1995-06-06 Rank Taylor Hobson, Ltd. Apparatus and method for establishing a reference signal with an LVDT
US5329416A (en) * 1993-07-06 1994-07-12 Alliedsignal Inc. Active broadband magnetic flux rate feedback sensing arrangement
US5420741A (en) * 1993-11-15 1995-05-30 Allied-Signal Inc. Passive tuned magnetic flux rate feedback sensing and control arrangement
US5617023A (en) * 1995-02-02 1997-04-01 Otis Elevator Company Industrial contactless position sensor
US5802728A (en) * 1995-08-17 1998-09-08 Watson Industries, Inc. Liquid level and angle detector
US5661397A (en) * 1995-09-22 1997-08-26 H. R. Textron Inc. Demodulator circuit for determining position, velocity and acceleration of displacement sensor independent of frequency or amplitude changes in sensor excitation signal
US5717331A (en) * 1995-09-22 1998-02-10 H.R. Textron, Inc. Demodulator circuit for use with a displacement sensor to provide position information
US5801645A (en) * 1996-07-18 1998-09-01 Allen-Bradley Company, Inc. Automatic paired LVDT probe balancing
IT1303968B1 (en) * 1998-10-26 2001-03-01 Marposs Spa LINEAR INDUCTIVE TRANSDUCERS.
ITRE20000043A1 (en) * 2000-05-10 2001-11-10 Lorenzo Zannini ENERGY DIMMER DRIVE (E.D.D.) - ENERGY PILOT
JP2003533040A (en) * 2000-05-10 2003-11-05 ロレンツォ ザンニーニ Energy reduction drive and energy pilot
US6864808B2 (en) * 2002-01-29 2005-03-08 Goodrich Pump & Engine Control Systems, Inc. System and method for processing a signal
US20040155651A1 (en) * 2003-02-12 2004-08-12 Britton Andrew Michael Flux control system for metal detectors
US20050278132A1 (en) * 2004-06-09 2005-12-15 Bauerle Paul A PWM dual store protection
US7006938B2 (en) * 2004-06-16 2006-02-28 Ami Semiconductor, Inc. Reactive sensor modules using Pade' Approximant based compensation and providing module-sourced excitation
FR2921166B1 (en) * 2007-09-14 2009-11-20 Thales Sa DEVICE AND METHOD FOR IMPROVED PRECISION DOUBLE ALTERNATIVE ADJUSTMENT
US8253278B2 (en) * 2008-06-05 2012-08-28 Qualcomm Incorporated Ferrite antennas for wireless power transfer
US9112508B2 (en) 2010-06-09 2015-08-18 Broadcom Corporation Adaptive powered local oscillator generator circuit and related method
US8929844B2 (en) * 2010-08-30 2015-01-06 Broadcom Corporation Variable gain control transformer and RF transmitter utilizing same
US8862064B2 (en) 2010-09-24 2014-10-14 Broadcom Corporation Self-testing transceiver architecture and related method
US8558408B2 (en) 2010-09-29 2013-10-15 General Electric Company System and method for providing redundant power to a device
US8478560B2 (en) 2011-01-19 2013-07-02 Honeywell International Inc. Three wire transformer position sensor, signal processing circuitry, and temperature compensation circuitry therefor
US8278779B2 (en) 2011-02-07 2012-10-02 General Electric Company System and method for providing redundant power to a device
US9464881B2 (en) 2012-08-01 2016-10-11 Silicon Works Co., Ltd. Displacement sensor, apparatus for detecting displacement, and method thereof
US9528815B2 (en) 2013-02-08 2016-12-27 Hamilton Sundstrand Corporation Transformer based sensor arrangement
FR3071922B1 (en) 2017-10-02 2019-11-15 Safran Electronics & Defense METHOD OF MEASURING A DISPLACEMENT

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US3235790A (en) * 1961-09-22 1966-02-15 Collins Corp G L Movable core transducer
GB1319586A (en) * 1969-10-06 1973-06-06 Findlay Irvine Ltd Displacement transducers
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Also Published As

Publication number Publication date
ATE150545T1 (en) 1997-04-15
EP0542725B1 (en) 1997-03-19
EP0542725A2 (en) 1993-05-19
ATE92620T1 (en) 1993-08-15
EP0741280A2 (en) 1996-11-06
EP0741280A3 (en) 1997-03-05
EP0542725A3 (en) 1994-06-08
EP0398901B1 (en) 1993-08-04
EP0398901A1 (en) 1990-11-28
WO1989004949A3 (en) 1989-11-02
JPH03501885A (en) 1991-04-25
DE3883011T2 (en) 1994-03-17
DE3855838D1 (en) 1997-04-24
WO1989004949A2 (en) 1989-06-01
US4904921A (en) 1990-02-27

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